CAJ | 학술논문

采用植物解剖学和通径分析方法研究皮层和中柱对水曲柳和落叶松人工林根系前2级根(最末端的根尖为1级根)直径变异的影响。结果表明：1)根直径、皮层厚度和中柱直径具有明显的季节变化，三者具有相同的变化规律；2)随着皮层厚度或中柱直径的增加，根直径显著增加，皮层厚度可以解释直径变异的85%～95%，中柱直径可以解释直径差异的92%～97%，表明皮层和中柱均对直径变异有重要的影响；3)通径分析结果显示，水曲柳根直径变异和季节变化主要是皮层变化起直接作用，中柱仅起间接作用；而落叶松则是皮层起间接作用，中柱起直接作用。研究结果为认识木本植物吸收根种内直径变异的机制提供重要基础。
채용식물해부학화통경분석방법연구피층화중주대수곡류화락협송인공림근계전2급근(최말단적근첨위1급근)직경변이적영향。결과표명：1)근직경、피층후도화중주직경구유명현적계절변화，삼자구유상동적변화규률；2)수착피층후도혹중주직경적증가，근직경현저증가，피층후도가이해석직경변이적85%～95%，중주직경가이해석직경차이적92%～97%，표명피층화중주균대직경변이유중요적영향；3)통경분석결과현시，수곡류근직경변이화계절변화주요시피층변화기직접작용，중주부기간접작용；이락협송칙시피층기간접작용，중주기직접작용。연구결과위인식목본식물흡수근충내직경변이적궤제제공중요기출。
The diameter of fine roots plays an important role in root physiological and ecological functions of woody plants. Fine root diameter varies greatly within or among tree species,even at the same root branch level. However,the underlying mechanism for such variation remains unclear. Although fine root morphology and anatomy in woody plants have been extensively studied during past decades,it is poorly understood for the mechanism of diameter variation in absorptive roots. In this study,we sampled fine roots from Fraxinus mandshurica and Larix gmelinii plantations,and measured root morphological ( diameter) and anatomical traits ( cortical thickness and stele diameter) ,and used path analysis to examine the effects of anatomical traits on root diameter variation of the two species. There were substantial and similar seasonal variations in root diameter,cortical thickness and stele diameter in both species. Root diameter increased with increasing of cortical thickness and stele diameter. Correlation analysis indicated that 85%-95% of the variations of root diameter could be explained by the variation of cortex thickness,and 92%-97% by variation of stele diameter,suggesting that the anatomical traits were important for root diameter variation in the two species. Path analysis showed that root diameter variation in F. mandshurica was affected directly by cortical thickness,and indirectly by stele diameter,however in L. gmelinii,it was affected directly by stele diameter,and indirectly by cortical thickness. These results may help us understand the mechanism of diameter variation of absorptive roots in woody plants.